Officially my employee works 40 hours because of the benefits if he were to need support from the government (ie parental leave, sickness leading to not being able to work). Off the record he does 30 hour weeks as I believe he will stay happy and more productive that way. I also pay full for gym membership and other stuff he might need.

Might be the same case here?

"30 Hour Jobs" is the title but the site is intended to capture all sorts of working environments that embrace reduced working hours or flexible work in some capacity.

You can read more about thoughtbot in issue #2: https://us19.campaign-archive.com/?u=f8a0d9af744b2eb7002632d...

Here's one - https://jobs.30hourjobs.com/jobs/4d4823a6-661c-451a-8418-6e8...

>"30 Hour Jobs is a job board for job seekers and employers who believe that shorter workweeks can lead to increased productivity and higher job satisfaction."

Doesn't mean you actually have to offer only 30 hrs.